Circulating device for internal-combustion boilers.



H. C. FREEMAN.

CIRCULATING DEVICE FOR INTERNAL COMBUSTION BOILERS.

APPLICATION FILED MAY 22. 1916.

2 SHEETS-SHEET I 1,262,035. Patented Apr. 9, 1918.

H. C. FREEMAN.

CIRCULATING DEVICE FOR INTERNAL COMBUSTION BOILERS.

APPLlCATION FILED MAY 22, 1916.

1,262,035., I v Patented Apr. 9,1918.

2 SHEETS-SHEET 2 HAROLD G. FREEMAN, OF RACINE, VJISCONSIN, ASSIGNOR TO THE S. FREEMAN & SONS MEG. 00., 0F RACINE, VJESCONSIN.

CIRCULATING DEVECE FOB INTERNAL-COMBUSTION BOILERS.

Specification of Letters Patent.

Patented Apr. 9, 1918.

Application filed May 22, 1916. Serial No. 99,184.

To all whom it may concern:

Be it known that I, HAROLD C. FREEMAN, acitizen of the United States, and resident of Racine, in the county of Racine and State of Wisconsin, have invented certain new and useful improvements in Circulating Devices for Internal-Combustion Boilers; and I do hereby declare that the following is a full, clear, and exact description thereof.

The present invention relates to new and useful improvements in boilers of the internal furnace type.

A common disadvantage of the internal furnace type of boilers is that an unequal heating is exerted on the water in the boiler whereby the lower portion of the boiler below the ash pits of the furnace tubes does not receive a suflicient supply of heat, and this condition interferes materially with the efficient operation of the boiler.

It is therefore the object of the present invention to overcome this disadvantage and it is more specifically an object in this connection to provide a circulating system for the water within the boiler, whereby a positive fiow of water is set up within the boiler to remove the aforementioned objectionable feature.

It is further an object to provide such a circulating system wherein a portion of the flow passes directly through the combustion chamber and thus receives an exceedingly great amount of heat to provide for a maximum positive flow of water.

It is still further an object of the invention to provide such a circulating system in connection with internal furnace boilers which may be associated therewith in a manner necessitating no change in the otherwise eiiicient general construction of this type of boiler.

With the above and other objects and advantages in view, the invention resides more particularly in the novel combination, arrangement and formation of parts more particularly hereinafter described and pointed out in the appended claim.

In the drawings:

Figure l is a top plan view of an internal furnace boiler of a double furnace type with the improved circulating means associated therewith.

Fig. 2 is a transverse sectional View therethrough on the line 22 of Fig. 1.

Fig. 3 is a similar view on the line 33 of Fig. 1.

Referring now more particularly to the accompanying drawings, 5 designates the usual cylindrical body of the boiler in the lower port-ion of which are disposed the furnace tubes 6 which are open at the front of the boiler and which communicate at the rear of the boiler with the gas combustion chamber 7 from the upper portion of which the usual gas flues 8-extend longitudinally through the boiler above the furnace tubes and communicate with the usual breeching 8 Thus while the upper portion of the boiler receives heat from the furnace tubes 6 and the lines 8, the lower part of the boiler does not receive corresponding suflicient heat and thus this improper heating results in an improper circulation of water with its consequent well known disadvantages.

The improved circulating means to overcome this disadvantage comprises a water tube 9 which extends diagonally in the combustion chamber and has its ends disposed outwardly thereof and provided with connecting boxes 10, to the upper of which is connected a pipe 11 that extends forwardly along the upper portion of the boiler and communicates therewith at 12.

To the lower connecting box 10 is connected a pipe 13 which extends to the rear of the boiler and is then directed laterally at 14 along the back of the boiler and then directed at 15 through the lower part of the combustion chamber and extended into the boiler and terminates at 16 adjacent the front portion of the boiler, that portion of the pipe which passes through the combustion chamber being protected as by an enlarged portion 17 of the fire lining of the chamber. The inlet port at 16 of this circulating system is thus disposed forwardly of the outlet port 12 and which latter port is near the rear of the boiler, and thus the relatively cold water in the lower portion of the boiler flows through the pipe portions 15, 14 and 13 and through the diagonal water tube 9 in the combustion chamber whereby it is subject to a great degree of heat to thus render more positive the circulation, and finally through the pipe 11 back into the boiler.

The essential feature of the present invention is the provision of a water tube in the combustion chamber which communicates at" its upper end with the top of the boiler and at its lower end with the bottom of the boiler at their intermediate portions, and the embodiment of the invention illustrated is the one most particularly adapted for-the certainspecific form of boiler with which it is shown associated and l'liiWll]. be understood that various embodiments of the invention may be employed to meet: varying conditions and to adapt the device-forgvari= ous specific types of'boilers, and either or both of the pipes 15 and 11 may be disposed within the boiler or may be disposed entirely outwardly of the boiler-should conditions render this arrangement advisable.

I:- claim:

Aeirculating device for an internal com;- bustion furnace boiler including a, boiler shell, a furnace shell therein, and a combuss tion chamber at the rearof the furnace shell, of a straight water. tube-extending diagonally across the combustion chamber with its ends projected eXteriorly thereof, boxes carried by the ends of said tube, a pipe connected with the box on the uppermost end of said tube, said pipe eXtending forwardly along the upperporti on ofthe boiler and therewith adjacent the. front portion there of; and enlargement formed by them-firing lining of the combustion chamber for pro testing-the portion of-thepipepassing therethrough substantially as described,

In testimony that I claimitheforegoing I have hereunto: setmy hand at Racine, in thecounty ofRacine and State of Wisconsin, in'the presence of twowitnesses.

HAROLD C. FREEMAN. Witnesses FRANK H. GUY, Gro E. COLBORN.

Copies of this patentmay be obtained ior five cents each,..by addressing, the.commissioner ofratents,

' Washington, D. 0. 

